<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        span {
            /* 小标签写宽高没有用 */
            width: 200px;
            height: 200px;
            background-color: #f00;
            margin-top: 50px;
            margin-left: 50px;

            float: left;
        }
    </style>
</head>

<body>

    <span>呵呵</span>

</body>

</html>